iSeries DB2 Universal Database for iSeries SQL Reference Version 5:
A date is a three-part value (year, month, and day) designating a point in time
under the Gregorian calendar16, which is assumed to have been in effect from the
year 1 A.D. The range of the year part is 0001 to 9999. The date formats *JUL,
*MDY, *DMY, and *YMD can only represent dates in the range 1940 through 2039.
So, you may want to use the date format *ISO, *USA, *EUR or *JIS.